US5495133A - Electric motor with high power and high rotational speed - Google Patents

Electric motor with high power and high rotational speed Download PDF

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Publication number
US5495133A
US5495133A US08/189,329 US18932994A US5495133A US 5495133 A US5495133 A US 5495133A US 18932994 A US18932994 A US 18932994A US 5495133 A US5495133 A US 5495133A
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United States
Prior art keywords
bars
bar
end portions
wall
further comprise
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US08/189,329
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English (en)
Inventor
Pierre Bawin
Roland Botte
Jean-Marie Edebouw
Dominique Gilon
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alstom Belgium SA
Converteam Motors SA
Original Assignee
GEC Alstom ACEC Energie SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP93870016A priority Critical patent/EP0608675B1/de
Priority to DE69300482T priority patent/DE69300482T2/de
Priority to FI940333A priority patent/FI101843B/fi
Application filed by GEC Alstom ACEC Energie SA filed Critical GEC Alstom ACEC Energie SA
Priority to US08/189,329 priority patent/US5495133A/en
Assigned to GEC ALSTHON ACEC ENERGIE reassignment GEC ALSTHON ACEC ENERGIE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAWIN, PIERRE, BOTTE, ROLAND, EDEBOUW, JEAN-MARIE, GILON, DOMINIQUE
Application granted granted Critical
Publication of US5495133A publication Critical patent/US5495133A/en
Assigned to ALSTOM MOTEURS S.A. reassignment ALSTOM MOTEURS S.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ALSTOM ACEC ENERGIE S.A., FORMERLY GEC ALSTHOM ACEC ENERGIE S.A.
Assigned to ALSTOM MOTEURS S.A. reassignment ALSTOM MOTEURS S.A. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: ALSTOM ACEC ENERGIE S.A., FORMERLY GEC ALSTHOM ACEC ENERGIE S.A.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • H02K17/168—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having single-cage rotors

Definitions

  • the present invention relates to high power electric motors which are intended to operate at very high rotational speeds. More particularly this invention is directed to improvements in rotors for such motors, particularly asynchronous motors.
  • the stiffness of the shaft does not impart sufficient rigidity to the rotor assembly to allow it to reach very high rotational speeds without encountering a critical bending speed.
  • Patent Application EP-A-0,343,313 describes a particularly favorable embodiment of an electric motor capable of developing high power and high rotational speed in which the rotor comprises a shaft on which a magnetic mass, preferably consisting of armature core disk laminations, is mounted by clamping.
  • the armature core is held by two plates which are secured to the shaft and joined together by bars.
  • the plates which are usually referred to as end rings, and bars form a "squirrel cage" and are fabricated from a material with high mechanical strength and low electrical resistivity.
  • the plates act as end rings for short circuiting the squirrel cage.
  • the bar-rings assembly constitutes a particularly hyperstatic assembly which is subjected to differential expansions which generate thermal imbalances.
  • Document DE-U-1,933,691 describes an electric motor having rotor bars which do not bear on the walls of the slot over the entire length of the motor. Furthermore, the assembly of the bars to the short circuiting rings is done through the use of a flexible connection.
  • Document JP-A-57 183241 describes a motor having a construction which makes it possible to prevent the bars from moving with respect to floating short circuiting rings.
  • Document JP-A-53,100,412 describes the use of longitudinal bars which are slit over their entire length for the purpose of preventing any movement of these bars in the slot of the short circuiting rings of an electric motor with the purpose of promoting a good contact for cooling.
  • the present invention overcomes the above-described and other disadvantages of the prior art and, in so doing, provides an electric motor with high power and high rotational speed which does not exhibit the drawbacks of the prior art.
  • the present invention is an improvement to the electric motor described in application EP-A-0,343,313, wherein the effects of thermal imbalances are attenuated while the bars constituting the squirrel cage, are capable of freely expanding longitudinally independently of one another.
  • the present invention thus is an electric motor with high power and high rotational speed capability consisting of a stator and a rotor.
  • the rotor comprises a shaft on which is mounted, by clamping with the aid of two plate-like end rings secured to the rotor shaft, a magnetic mass.
  • This magnetic mass preferably consists of a stack of armature core disk laminations and a squirrel cage consisting of a plurality of longitudinal bars joined together by the short circuiting end rings.
  • the bars of the squirrel cage are fixed to the rotor at a single point, preferably at its middle. Fixing may be via any means known per se, for example with the aid of a screw, a pin or by welding, etc . . .
  • Motors of the type being described typically have a variable frequency controller which provides low starting current.
  • the slight pressure of the bars in the receiving apertures of the end rings is sufficient to permit the flow of the starting current.
  • the ends of the longitudinal squirrel cage bars are hollowed out and slit over a distance which corresponds to the axial thickness of the short circuiting ring to form "lips".
  • the lips at the end of the bar advantageously move apart and thereby exert a greater and greater pressure on the internal face of the corresponding aperture in the short circuiting ring, thus providing an excellent contact between the bar and the ring.
  • ends of the longitudinal squirrel cage bars are preferably provided with a coating which reduces the friction between the ends of the bars and the walls of the cooperating apertures.
  • the internal face of the blind holes, i.e., the hollowed out portions, of the ends of the bars are screw-threaded so as to permit the mounting of balancing weights therein.
  • FIG. 1 represents a view in longitudinal section of the rotor of an electric motor with high power and high rotational speed according to the present invention.
  • FIG. 2 represents a view in longitudinal section of a squirrel cage bar of the rotor of FIG. 1.
  • FIGS. 3 and 3b represent cross-sectional views, taken transverse to FIG. 2 of two embodiments of longitudinal squirrel cage bars for the use in the present invention.
  • FIG. 1 represents solely the rotor of a motor according to the present invention, i.e., the cooperating stator does not include novel features of the invention and thus has not been shown.
  • the stator will be coaxial with the rotor and radially spaced therefrom by an air gap.
  • the rotor includes a shaft 4 supported at its opposite ends in suitable bearings, not shown.
  • a magnetic mass 1 consisting of armature core disk laminations is mounted on shaft 4, the armature core disk laminations being held on the shaft by clamping.
  • the armature core disk laminations are clamped against one another by a pair of oppositely disposed end rings 2. End rings 2 are press fit onto shaft 4.
  • the bars 3 and the rings 2 consist of copper alloy which has a high mechanical strength and low electrical resistivity.
  • the bars are fixed at a single point, preferably at their middle, to the magnetic mass 1, i.e., the armature core, with the aid of a fastening means 5.
  • the fastening means may be any means known per se, for example a screw, a pin, or the fastening may be by welding.
  • the ends of the bars 3 are slidably received in apertures provided.
  • at least the end portions of bars 3 have a circular cross-section and the apertures which receive these bar end portions have an inner diameter which is slightly greater than the outer diameter of the end portions of the bars 3 which will be housed therein. In this way, a small tolerance clearance remains which allows the bars to expand freely in the apertures in the end rings 2, but this clearance must nevertheless be sufficiently small so as to ensure sufficient contact so that current may flow between the bars and rings even when the rotor is at rest.
  • the ends of the bars 3 have a coating, obtained by galvanostegy, which gives them a sliding contact in the orifice of the short circuiting ring 2.
  • the ends of the bars 3 are hollowed out, i.e., are provided with blind holes and slit over a distance which corresponds essentially to the axial thickness of the short circuiting ring 2.
  • the fact that the ends of the bars 3 are provided with one or more slits, represented in FIGS. 3a and 3b, allows the lip portions 31 and 32 of the bar 3 defined by the slits to move apart under the action of centrifugal force and thereby exert a pressure, which increases with the rotational speed, on the internal face of the cooperating aperture thus providing an enhanced electrical contact while allowing sliding under the action of the expansion.
  • the free expansion of the bars making up the squirrel cage may take place independently of one another and thereby allows the distortional effects due to thermal imbalances to be decreased.
  • the hollowed-out ends of the bars 3 are advantageously screw-threaded so that balancing weights 6 can be inserted therein.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Induction Machinery (AREA)
US08/189,329 1993-01-26 1994-01-31 Electric motor with high power and high rotational speed Expired - Lifetime US5495133A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP93870016A EP0608675B1 (de) 1993-01-26 1993-01-26 Elektrischer Motor mit hoher Drehgeschwindigkeit und hoher Leistung
DE69300482T DE69300482T2 (de) 1993-01-26 1993-01-26 Elektrischer Motor mit hoher Drehgeschwindigkeit und hoher Leistung.
FI940333A FI101843B (fi) 1993-01-26 1994-01-24 Sähkömoottori, jolla on suuri teho ja pyörimisnopeus
US08/189,329 US5495133A (en) 1993-01-26 1994-01-31 Electric motor with high power and high rotational speed

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP93870016A EP0608675B1 (de) 1993-01-26 1993-01-26 Elektrischer Motor mit hoher Drehgeschwindigkeit und hoher Leistung
US08/189,329 US5495133A (en) 1993-01-26 1994-01-31 Electric motor with high power and high rotational speed

Publications (1)

Publication Number Publication Date
US5495133A true US5495133A (en) 1996-02-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
US08/189,329 Expired - Lifetime US5495133A (en) 1993-01-26 1994-01-31 Electric motor with high power and high rotational speed

Country Status (4)

Country Link
US (1) US5495133A (de)
EP (1) EP0608675B1 (de)
DE (1) DE69300482T2 (de)
FI (1) FI101843B (de)

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5736707A (en) * 1996-04-17 1998-04-07 General Electric Company Electric resistance welding of electric motor cage rotor assemblies
US6608733B2 (en) * 1999-05-28 2003-08-19 Seagate Technology Llc Two-plane balance for spindle motors
US6727634B2 (en) 2001-08-30 2004-04-27 Honeywell International, Inc. System and method for end turn retention on a high speed generator rotor
US6734585B2 (en) 2001-11-16 2004-05-11 Honeywell International, Inc. Rotor end caps and a method of cooling a high speed generator
US6753637B2 (en) 2001-09-07 2004-06-22 Honeywell International, Inc. Exciter rotor assembly
US6791230B2 (en) 2001-09-07 2004-09-14 Honeywell International, Inc. System and method for retaining wedges in a rotor
US20050023924A1 (en) * 2003-07-29 2005-02-03 Tornquist Gerald E. High speed generator with rotor coil support assemblies secured to interlamination disks
US6859019B2 (en) 2001-08-30 2005-02-22 Honeywell International, Inc. System and method for coupling rectifiers of an exciter to the rotor of a main generator
US20070090701A1 (en) * 2005-10-25 2007-04-26 Honeywell International, Inc. Multi-plane flexible rotor balancing
US20110080068A1 (en) * 2009-10-06 2011-04-07 General Electric Company Laminated generator rotor structure and related method
US20110084568A1 (en) * 2009-09-30 2011-04-14 Converteam Technology Ltd. Rotor for electric motor optimized for high power
US8274190B2 (en) * 2010-05-28 2012-09-25 General Electric Company Electric machine rotor bar and method of making same
US20130187507A1 (en) * 2010-10-07 2013-07-25 Moteurs Leroy-Somer Rotor comprising added pole shoes covering the magnets and a rotary electric machine
US9190879B2 (en) 2011-07-06 2015-11-17 General Electric Company Laminated rotor machining enhancement
US9325218B2 (en) 2011-07-06 2016-04-26 General Electric Company Laminated rotor balancing provisions
RU2719602C1 (ru) * 2019-12-10 2020-04-21 Публичное Акционерное Общество "Силовые Машины-Зтл, Лмз, Электросила, Энергомашэкспорт" (Пао "Силовые Машины") Короткозамкнутый ротор асинхронного электродвигателя
US11258322B2 (en) 2018-12-20 2022-02-22 Teco-Westinghouse Motor Company High speed induction machine
US20220123637A1 (en) * 2018-12-14 2022-04-21 Ge Energy Power Conversion Technology Limited Conductor Bar and Associated Rotor and Rotating Electrical Machine
RU2802343C1 (ru) * 2019-11-18 2023-08-25 Сименс Акциенгезелльшафт Короткозамкнутый ротор с опорным элементом

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009041564A1 (de) 2009-09-15 2011-03-24 Man Diesel & Turbo Se Kurzschlussläufer und Verfahren zum Herstellen eines solchen Kurzschlussläufers
EP3051675A1 (de) * 2015-01-27 2016-08-03 GE Energy Power Conversion Technology Ltd Kurzschlusslaeufer und asynchronmotor mit einem derartigen rotor umfassenden motor
EP3051674A1 (de) 2015-01-27 2016-08-03 GE Energy Power Conversion Technology Ltd Asynchronrotor für asynchronmotor
FR3090234B1 (fr) 2018-12-14 2021-11-12 Ge Energy Power Conversion Technology Ltd Rotor à arbre non traversant et machine électrique tournante associée
FR3090232B1 (fr) 2018-12-14 2020-12-18 Ge Energy Power Conversion Technology Ltd Rotor pour machine electrique tournante asynchrone a cage d’ecureuil et machine tournante associee

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH89129A (fr) * 1916-10-10 1921-05-02 Submersible & J L Motors Ltd Procédé pour joindre les barres du rotor d'un moteur électrique à une bague terminale.
US3134040A (en) * 1960-06-07 1964-05-19 Carrier Corp Dynamoelectric machines with protection for squirrel cage expansion
US3517238A (en) * 1968-04-04 1970-06-23 Gen Electric Squirrel cage rotor and method of building the same
US4064410A (en) * 1975-04-22 1977-12-20 Service First, Inc. Squirrel cage rotor and method of making same
US4362959A (en) * 1980-05-15 1982-12-07 Siemens-Allis, Inc. Electric motor rotor with fitted vent spacers
US4490638A (en) * 1983-08-08 1984-12-25 Mcgraw-Edison Company Salient pole rotor with amortisseur winding
EP0343313A1 (de) * 1988-05-27 1989-11-29 Gec Alsthom Acec Energie S.A. Elektrischer Motor hoher Leistung und hoher Umdrehungsgeschwindigkeit
US5068560A (en) * 1990-12-26 1991-11-26 Lynn Lundquist Reduced current starting mechanism for three phase squirrel cage motors
WO1993000735A1 (en) * 1991-06-28 1993-01-07 Fanuc Ltd Rotor for high-speed induction ac motor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1933691U (de) * 1962-09-27 1966-03-03 Bbc Brown Boveri & Cie Hochstab-kaefigwicklung fuer stromverdraengungslaeufer elektrischer maschinen.

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH89129A (fr) * 1916-10-10 1921-05-02 Submersible & J L Motors Ltd Procédé pour joindre les barres du rotor d'un moteur électrique à une bague terminale.
US3134040A (en) * 1960-06-07 1964-05-19 Carrier Corp Dynamoelectric machines with protection for squirrel cage expansion
US3517238A (en) * 1968-04-04 1970-06-23 Gen Electric Squirrel cage rotor and method of building the same
US4064410A (en) * 1975-04-22 1977-12-20 Service First, Inc. Squirrel cage rotor and method of making same
US4362959A (en) * 1980-05-15 1982-12-07 Siemens-Allis, Inc. Electric motor rotor with fitted vent spacers
US4490638A (en) * 1983-08-08 1984-12-25 Mcgraw-Edison Company Salient pole rotor with amortisseur winding
EP0343313A1 (de) * 1988-05-27 1989-11-29 Gec Alsthom Acec Energie S.A. Elektrischer Motor hoher Leistung und hoher Umdrehungsgeschwindigkeit
US5068560A (en) * 1990-12-26 1991-11-26 Lynn Lundquist Reduced current starting mechanism for three phase squirrel cage motors
WO1993000735A1 (en) * 1991-06-28 1993-01-07 Fanuc Ltd Rotor for high-speed induction ac motor

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
Vol. 2, No. 133, Sep. 1, 1978; #100, 412; Japan (Abstract).
Vol. 2, No. 133, Sep. 1, 1978; 100, 412; Japan (Abstract). *
Vol. 7, No. 27 (E 156); Feb. 3, 1983; 183,241; Nov. 11, 1982 Japan (Abstract). *
Vol. 7, No. 27 (E-156); Feb. 3, 1983; 183,241; Nov. 11, 1982 Japan (Abstract).

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5736707A (en) * 1996-04-17 1998-04-07 General Electric Company Electric resistance welding of electric motor cage rotor assemblies
US6608733B2 (en) * 1999-05-28 2003-08-19 Seagate Technology Llc Two-plane balance for spindle motors
US6727634B2 (en) 2001-08-30 2004-04-27 Honeywell International, Inc. System and method for end turn retention on a high speed generator rotor
US6859019B2 (en) 2001-08-30 2005-02-22 Honeywell International, Inc. System and method for coupling rectifiers of an exciter to the rotor of a main generator
US6753637B2 (en) 2001-09-07 2004-06-22 Honeywell International, Inc. Exciter rotor assembly
US6791230B2 (en) 2001-09-07 2004-09-14 Honeywell International, Inc. System and method for retaining wedges in a rotor
US6734585B2 (en) 2001-11-16 2004-05-11 Honeywell International, Inc. Rotor end caps and a method of cooling a high speed generator
US20050023924A1 (en) * 2003-07-29 2005-02-03 Tornquist Gerald E. High speed generator with rotor coil support assemblies secured to interlamination disks
US7015617B2 (en) 2003-07-29 2006-03-21 Honeywell International, Inc. High speed generator with rotor coil support assemblies secured to interlamination disks
US20070090701A1 (en) * 2005-10-25 2007-04-26 Honeywell International, Inc. Multi-plane flexible rotor balancing
US7342331B2 (en) 2005-10-25 2008-03-11 Honeywell International, Inc. Multi-plane flexible rotor balancing
US20110084568A1 (en) * 2009-09-30 2011-04-14 Converteam Technology Ltd. Rotor for electric motor optimized for high power
US8421296B2 (en) * 2009-09-30 2013-04-16 Converteam Technology Ltd. Rotor for electric motor optimized for high power
US20110080068A1 (en) * 2009-10-06 2011-04-07 General Electric Company Laminated generator rotor structure and related method
US8274190B2 (en) * 2010-05-28 2012-09-25 General Electric Company Electric machine rotor bar and method of making same
US9438077B2 (en) 2010-05-28 2016-09-06 James P. Alexander Electric machine rotor bar and method of making same
US20130187507A1 (en) * 2010-10-07 2013-07-25 Moteurs Leroy-Somer Rotor comprising added pole shoes covering the magnets and a rotary electric machine
US9190879B2 (en) 2011-07-06 2015-11-17 General Electric Company Laminated rotor machining enhancement
US9325218B2 (en) 2011-07-06 2016-04-26 General Electric Company Laminated rotor balancing provisions
US20220123637A1 (en) * 2018-12-14 2022-04-21 Ge Energy Power Conversion Technology Limited Conductor Bar and Associated Rotor and Rotating Electrical Machine
US11888365B2 (en) * 2018-12-14 2024-01-30 Ge Energy Power Conversion Technology Limited Conductor bar and associated rotor and rotating electrical machine
US11258322B2 (en) 2018-12-20 2022-02-22 Teco-Westinghouse Motor Company High speed induction machine
RU2802343C1 (ru) * 2019-11-18 2023-08-25 Сименс Акциенгезелльшафт Короткозамкнутый ротор с опорным элементом
RU2719602C1 (ru) * 2019-12-10 2020-04-21 Публичное Акционерное Общество "Силовые Машины-Зтл, Лмз, Электросила, Энергомашэкспорт" (Пао "Силовые Машины") Короткозамкнутый ротор асинхронного электродвигателя

Also Published As

Publication number Publication date
EP0608675B1 (de) 1995-09-13
FI101843B1 (fi) 1998-08-31
FI940333A0 (fi) 1994-01-24
DE69300482D1 (de) 1995-10-19
FI101843B (fi) 1998-08-31
FI940333A (fi) 1994-07-27
DE69300482T2 (de) 1996-05-02
EP0608675A1 (de) 1994-08-03

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